SPECIAL CONSIDERATIONS OF HEAT GENERATION IN THE INTERNAL COMBUSTION ENGINE

Apply

SPECIAL CONSIDERATIONS OF HEAT GENERATION IN THE INTERNAL COMBUSTION ENGINE

Journal Title: Автомобильный транспорт - Year 2018, Vol 42, Issue

Abstract

Problem. The study illustrates special considera-tions of heat generation in the internal combustion engine. The research was conducted using hard / soft technology. An exponential analytical descrip-tion is found to qualitatively reflect actual processes in an acceptable way. The study dismisses some standard notions about typical and optimal rela-tions between parameters characterizing the course of heat generation. Goal. The purpose is to investi-gate the regular heat generation in an internal combustion engine by resorting to, so to speak, hard/soft technologies, combining the test bench and the computer and thus providing a «communi-cation» of a real research engine and virtual in form computer model. Methodology. As it follows from the research, the proportion of burned fuel decreas-es with the decreasing load and becomes the small-est in case of idle engine running. The concept of the amount of unburned fuel is quite conditional – it characterizes incomplete chemical transformations rather than absolute inactivity of the other amount of fuel. The given value contains useful information that the heat generation capacity of the fuel mixture is underutilized and it displays potential environ-mental hazards. The analytic description contains the parameter a that is supposed to characterize a complete fuel combustion rather than convey a spe-cific fixed value (namely, ) based on the researcher’s prediction without persuasive arguments. The time parameter denoting the duration of heat generation should be considered as a time stable that characterizes an asymptotic nature of the process rather than the actual duration of the combustion process ( the combustion would have been indefinitely long). Results. There are beliefs that the actual engines have the values of the pa-rameter m that characterises the degree of fuel com-bustion and of the parameter that corresponds to the duration of the combustion process: diesel engines - and (and even more) degrees of rotation of the crankshaft; Otto engines - and deg. The study demonstrates that the statement about Otto engine doesn’t confirm but rather reject the mentioned above. Moreover, it is also argued that special studies seem to prove the following: the combination of parameter values and degrees is roughly optimal. The value of degree m, appears to correspond to the moment of reaching the maximum combustion rate that satisfies the condition ( and - the beginning and end of the combustion process). It turned out that these parameters only formally denote the minimum of the dependence of maximum combustion rate on a set of different permissible values of the parameter m and it doesn’t reveal any physical meaning of «optimality», but rather provoke a thor-ough investigation of this circumstance.

Authors and Affiliations

P. Hashchuk, S. Nikipchuk

Keywords

EP ID EP407983
DOI -
Views 75
Downloads 0